4 files changed, 46 insertions, 4 deletions

diff --git a/include/Scintilla.h b/include/Scintilla.h
index cc9eeb593..fa1003ab4 100644
--- a/include/Scintilla.h
+++ b/include/Scintilla.h
@@ -277,6 +277,9 @@ typedef sptr_t (*SciFnDirect)(sptr_t ptr, unsigned int iMessage, uptr_t wParam,
 #define SCI_GETOVERTYPE 2187
 #define SCI_SETCARETWIDTH 2188
 #define SCI_GETCARETWIDTH 2189
+#define SCI_SETTARGETSTART 2190
+#define SCI_SETTARGETEND 2191
+#define SCI_REPLACETARGET 2192
 #define SCI_CALLTIPSHOW 2200
 #define SCI_CALLTIPCANCEL 2201
 #define SCI_CALLTIPACTIVE 2202
diff --git a/include/Scintilla.iface b/include/Scintilla.iface
index cb524f185..8fdbdedcc 100644
--- a/include/Scintilla.iface
+++ b/include/Scintilla.iface
@@ -708,6 +708,17 @@ set void SetCaretWidth=2188(int pixelWidth,)
 # Returns the width of the insert mode caret
 get int GetCaretWidth=2189(,)
 
+# Sets the position that starts the target which is used for updating the 
+# document without affecting the scroll position.
+set void SetTargetStart=2190(position pos,)
+
+# Sets the position that ends the target which is used for updating the 
+# document without affecting the scroll position.
+set void SetTargetEnd=2191(position pos,)
+
+# Replace the target text with the argument text.
+fun void ReplaceTarget=2192(, string text)
+
 # Show a call tip containing a definition near position pos.
 fun void CallTipShow=2200(position pos, string definition)
 
diff --git a/src/Editor.cxx b/src/Editor.cxx
index 479157e39..9f65203d2 100644
--- a/src/Editor.cxx
+++ b/src/Editor.cxx
@@ -92,6 +92,9 @@ Editor::Editor() {
 	currentPos = 0;
 	anchor = 0;
 
+	targetStart = 0;
+	targetEnd = 0;
+	
 	topLine = 0;
 	posTopLine = 0;
 
@@ -1570,7 +1573,7 @@ void Editor::AddCharUTF(char *s, unsigned int len) {
 
 void Editor::ClearSelection() {
 	if (selType == selRectangle) {
-    	pdoc->BeginUndoAction();
+    		pdoc->BeginUndoAction();
 		int lineStart = pdoc->LineFromPosition(SelectionStart());
 		int lineEnd = pdoc->LineFromPosition(SelectionEnd());
 		int startPos = SelectionStart();
@@ -1582,16 +1585,16 @@ void Editor::ClearSelection() {
 			}
 		}
 		SetEmptySelection(startPos);
-    	pdoc->EndUndoAction();
+    		pdoc->EndUndoAction();
 		selType = selStream;
 	} else {
 		int startPos = SelectionStart();
 		unsigned int chars = SelectionEnd() - startPos;
 		SetEmptySelection(startPos);
 		if (0 != chars) {
-           	pdoc->BeginUndoAction();
+           		pdoc->BeginUndoAction();
 			pdoc->DeleteChars(startPos, chars);
-           	pdoc->EndUndoAction();
+           		pdoc->EndUndoAction();
 		}
 	}
 }
@@ -3555,6 +3558,29 @@ sptr_t Editor::WndProc(unsigned int iMessage, uptr_t wParam, sptr_t lParam) {
 		}
 		break;
 
+	case SCI_SETTARGETSTART:
+		targetStart = wParam;
+		break;
+	
+	case SCI_SETTARGETEND:
+		targetEnd = wParam;
+		break;
+	
+	case SCI_REPLACETARGET: {
+			if (lParam == 0)
+				return 0;
+			pdoc->BeginUndoAction();
+			unsigned int chars = targetEnd - targetStart;
+			if (targetStart != targetEnd)
+				pdoc->DeleteChars(targetStart, chars);
+			targetEnd = targetStart;
+			char *replacement = reinterpret_cast<char *>(lParam);
+			pdoc->InsertString(targetStart, replacement);
+			targetEnd = targetStart + strlen(replacement);
+			pdoc->EndUndoAction();
+		}
+		break;
+	
 	case EM_LINESCROLL:
 	case SCI_LINESCROLL:
 		ScrollTo(topLine + lParam);
diff --git a/src/Editor.h b/src/Editor.h
index cf3996ffa..e82496663 100644
--- a/src/Editor.h
+++ b/src/Editor.h
@@ -116,6 +116,8 @@ protected:	// ScintillaBase subclass needs access to much of Editor
 	int originalAnchorPos;
 	int currentPos;
 	int anchor;
+	int targetStart;
+	int targetEnd;
 	int topLine;
 	int posTopLine;